Would you mind linking to a couple of them? I don't know anything about Elixir (but am very comfortable in a lot of other languages), and am interested in the kind of thing more experienced people are using with Elixir. Thanks!
DB development usually uses Ecto: https://github.com/elixir-ecto/ecto, it has OTP servers for connection pooling and other tasks.
For managing background tasks I use Honeydew: https://github.com/koudelka/honeydew
for the lazy: https://github.com/phoenixframework/phoenix